The Predictive Analysis application facilitates creating, managing, evaluating, and updating an agency’s Safety Performance Functions (SPFs) in an easily accessible interface.
Learn more about the Predictive Analysis application here.
Segments: Predictive Attributes
The following outlines Alabama’s chosen predictive attributes used to generate Optimal Fit SPF groupings for segments:
Urban/Rural
Urban
Rural
Route Type
Interstate (IN)
Local (IV)
Ramp (RP)
State (AL)
Unknown
Number of Lanes
1 Lane
2 Lanes
3 Lanes
4 Lanes
Divided/Undivided
Divided
Undivided
Crash Attributes
All Crashes
Fatal and all Injury
Requirements for Optimal Fit Creation
Minimum Crashes: 100
Minimum Segments: 50
Intersections: Predictive Attributes
The following outlines Alabama’s chosen predictive attributes used to generate Optimal Fit SPF groupings for intersections:
Urban/Rural
Urban
Rural
Intersection Type
T-Intersection
Y- Intersection
Roundabouts
Five or More Legs and Not Circular
Other Circular Intersections (E.G. Rotaries, Neighborhood Traffic Circles
Cross-Intersections (Four Legs)
Traffic Control Type
All-Way Stop
Flash Beacon (Include Rectangular Rapid Flash Beacon)
Other
Railroad Crossing, Crossbucks Only
Railroad Crossing, Flashing Lights Only
Railroad Crossing, Gates and Flashing Lights
Railroad Crossing, Stop-Sign Controlled
Signalized
Two-Way
Uncontrolled
Yield Sign
Crash Attributes
All Crashes
Fatal and all Injury
Requirements for Optimal Fit Creation
Minimum Crashes: 100
Minimum Segments: 50